JavaScript: Check whether a given value is UK Post Code or not

JavaScript validation with regular expression: Exercise-13 with Solution

Validate UK Post Code

Write a JavaScript function to check whether a given value is a UK Post Code or not.

Sample Solution:

JavaScript Code:

function is_ukPostCode(str)
{
 regexp = /^[A-Z]{1,2}[0-9RCHNQ][0-9A-Z]?\s?[0-9][ABD-HJLNP-UW-Z]{2}$|^[A-Z]{2}-?[0-9]{4}$/;
  
        if (regexp.test(str))
          {
            return true;
          }
        else
          {
            return false;
          }
}

console.log(is_ukPostCode("B294HJ"));

console.log(is_ukPostCode("7892"));

Output:

true
false

Flowchart:

Live Demo:

See the Pen javascript-regexp-exercise-13 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript function that uses a regular expression to validate UK post codes according to official formats.
• Write a JavaScript function that tests a variety of UK post code examples and returns true if they match the pattern.
• Write a JavaScript function that normalizes the input (e.g., trimming spaces) before validating the post code.
• Write a JavaScript function that compares the input against multiple regex patterns to handle different UK post code formats.

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